Online source for odd cuts of meat

This is a bit of an odd question, but I am in the process of writing a paper on Joyce's Ulysses and am in need of a pork kidney. There isn't a butcher in my city that handles that sort of thing and the only online source that I've been able to identify has a minimum order of 50 lbs. Has anyone come across a supplier that could be of some assistance?

Because many cities may have restrictions on livestock (alive) or butchers prefer dressed hanging carcases, that may be your stumbling block. It could be of some benefit to look for a full service meat packer that is located further out of your city.